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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <signal.h>
#include "npserver.h"
int NP_Server::sort_file( char *filename, void ( *SIGALRM_handler )( int ))
{
unsigned int i, count;
char **array, buffer[ 1024 ], second_buffer[ 1024 ], third_buffer[ 1024],
*home;
FILE *file, *temp;
snprintf( third_buffer, sizeof third_buffer, "%s/%s",
home = getenv( "HOME" ), filename );
if (( file = fopen( third_buffer, "r" )) == NULL )
{
snprintf( error_message, sizeof error_message,
"NP_Server: sort_file(): fopen() returned error: %s.",
strerror( errno ));
return 1;
}
snprintf( second_buffer, sizeof second_buffer, "%s.tmp", third_buffer );
if (( temp = fopen( second_buffer, "w" )) == NULL )
{
fclose( file );
snprintf( error_message, sizeof error_message,
"NP_Server: sort_file(): fopen() returned error: %s.",
strerror( errno ));
return 1;
}
count = 0;
while( fgets( buffer, sizeof buffer, file ) != NULL )
++count;
if ( count > 5000 )
{
fclose( file );
fclose( temp );
snprintf( buffer, sizeof buffer, "sort %s >%s", third_buffer,
second_buffer );
system( buffer );
}
else
{
if (( array = ( char **)calloc( count, sizeof *array )) == NULL )
{
perror( "calloc" );
exit( 1 );
}
rewind( file );
for( i = 0; i < count; ++i )
{
fgets( buffer, sizeof buffer, file );
if (( array[ i ] = ( char *)malloc( sizeof( buffer ) + 1 )) == NULL )
{
perror( "malloc" );
exit( 1 );
}
strcpy( array[ i ], buffer );
}
fclose( file );
struct itimerval tval;
if ( SIGALRM_handler != NULL )
{
tval.it_interval.tv_sec = 0;
tval.it_interval.tv_usec = 250000;
tval.it_value.tv_sec = 0;
tval.it_value.tv_usec = 250000;
setitimer( ITIMER_REAL, &tval, NULL );
signal( SIGALRM, SIGALRM_handler );
}
qsort( array, count, sizeof *array, compare );
if ( SIGALRM_handler != NULL )
{
tval.it_value.tv_sec = 0;
tval.it_value.tv_usec = 0;
setitimer( ITIMER_REAL, &tval, NULL );
}
for( i = 0; i < count; ++i )
{
fputs( array[ i ], temp );
free( array [ i ] );
}
free( array );
fclose( temp );
}
rename( second_buffer, third_buffer );
return 0;
}
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